JP2022547979A - battery separators, batteries and battery packs - Google Patents

Abstract

The battery separator includes a separator body (10) and an insulating adhesive tape (20) attached to the separator body (10), the separator body (10) facing the separator in a second direction. an insulating adhesive tape ( 20) includes an adhesive tape first side (201) and an adhesive tape second side (202) facing each other in the second direction, and an adhesive tape first end (203) facing each other in the first direction. ) and an adhesive tape second end (204), the insulating adhesive tape (20) is attached to the separator body (10) along the first direction, the adhesive tape first side (101) is attached to the separator Positioned corresponding to the first side (201), the insulating adhesive tape (20) extends along the first direction from the separator first end (103) to the separator second end (104).

Description

(Cross reference to related applications)
This application claims the priority of Chinese Patent Application No. "201910862204.9" entitled "Battery Separator, Battery, Battery Module, Battery Pack and Automobile" filed on Sep. 12, 2019 by BWID Company Limited. It is something to do.
The present application relates to the technical field of batteries, and more particularly to battery separators, batteries and battery packs.

In order to reduce the internal resistance of the battery, improve the capacity of the battery, and reduce the difficulty of automatic production of the battery, currently in the production process of the battery in the market, the conventional method of attaching separate tabs to the electrode sheet is used. Therefore, the electrode sheet is die-cut, and after the electrode sheet is die-cut, the tab is directly formed from the portion left in advance.

Since die-cutting is used to form tabs, burrs remain around the tabs due to the die-cutting process. Realize In the process of folding, due to the presence of burrs on the electrode sheet (especially the positive electrode sheet), there is a risk that the burrs will pierce the separator, which will eventually cause the positive and negative electrodes to contact and short-circuit, which will affect the safety of the battery. It can have a big impact.

In the prior art, in order to solve the above problems and prevent the short circuit between the positive electrode and the negative electrode caused by the burr piercing the separator, generally both sides of the positive electrode sheet are coated with a ceramic coating of a certain thickness. , such as boehmite or aluminum oxide, the ceramic coating is located between the positive electrode sheet and the negative electrode sheet, to some extent can prevent the burr from piercing the separator, and reduce the probability of short circuit. .

In the manufacturing process of the battery, it is necessary to first apply boehmite or aluminum oxide to the positive electrode sheet and then die cut the positive electrode sheet to form a tab. First, with regard to coating boehmite or aluminum oxide on the positive electrode sheet, the coating thickness is difficult to control, the stability is low, and the process is difficult. The positive electrode sheet after coating cannot produce wavy edges when slitting, and the die-cutting parameter window is small, which adversely affects the die-cutting. At the same time, when die-cutting, defects such as slags and burrs are likely to occur on the edges, and the slags and burrs will still pierce the separator and contact the negative electrode sheet, causing internal short circuits in the battery and affecting the safety of the battery. may give.

Applying boehmite or aluminum oxide can reduce the risk of burr puncturing the separator to some extent, but the ability to prevent puncture and short circuit is limited, so it is not enough to meet people's increasing requirements for battery safety performance. can not be satisfied.

The present application aims at solving at least one of the technical problems in the prior art. To this end, the present application provides a battery separator that can effectively prevent burrs from piercing the separator and ensure high safety of the battery.

The battery separator includes a separator body and an insulating adhesive tape attached to the separator body, the separator body comprising a separator first side and a separator second side facing each other in a second direction; a separator first end and a separator second end facing each other in one direction, wherein the insulating adhesive tape comprises an adhesive tape first side and an adhesive tape second opposite each other in the second direction; and an adhesive tape first end and an adhesive tape second end facing each other in the first direction, wherein the insulating adhesive tape is attached to the separator body along the first direction. , the adhesive tape first side is installed corresponding to the separator first side, and the insulating adhesive tape extends from the separator first end to the separator second end along the first direction.

As a result, when a cell is formed by combining the positive electrode sheet and the negative electrode sheet, the insulating adhesive tape attached to the separator body effectively prevents the burrs remaining after die-cutting the electrode sheet from piercing the separator. It is possible to reduce the risk of short circuits caused by burrs sticking into the separator inside the cell. In addition, since the insulating adhesive tape is attached to the separator body and extends from the first end of the separator to the second end of the separator along the first direction, the position of the insulating adhesive tape in the first direction cannot be changed during the manufacturing process. is not required to be positioned and controlled, reducing manufacturing difficulty. At the same time, the combination of the separator body and the insulating adhesive tape can be formed in the process of stacking or winding the cells, and the process step can be achieved by perfectly combining the installation of the insulating adhesive tape and the cell manufacturing process. and the die-cutting of the electrode sheet and the installation of the insulating adhesive tape can be separated, and the die-cutting of the electrode sheet is not affected, and the safety assurance is not affected.

The battery includes a positive electrode sheet, a negative electrode sheet and a separator, wherein the separator is positioned at least partially between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheets are positioned facing each other in a second direction. a cathode sheet first side and a cathode sheet second side, wherein the separator first side and the cathode sheet first side are disposed on the same side; a cathode tab is disposed on the cathode sheet first side; and a cathode sheet is disposed on the anode sheet. A tab is installed, the separator is a battery separator according to the present application, the positive electrode sheet first side is positioned between the adhesive tape first side and the adhesive tape second side in the second direction, and the adhesive A tape second side is positioned between the cathode sheet first side and the cathode sheet second side in the second direction.

A battery pack includes a battery according to the present application.

Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be apparent in the description, or may be learned by practice of the application.

The above and/or additional aspects and advantages of the present application will become apparent and readily understood by describing the embodiments with reference to the following drawings.

1 is a schematic configuration diagram of a separator in one embodiment of the present application; FIG. FIG. 4 is a schematic configuration diagram of a separator in another embodiment of the present application; 1 is a schematic cross-sectional view of a separator in one embodiment of the present application; FIG. 1 is a schematic diagram of a non-die-cut positive electrode sheet in one embodiment of the present application; FIG. FIG. 2 is a schematic configuration diagram of a die-cut positive electrode sheet in one example of the present application; FIG. 4 is a schematic diagram of the positional relationship between a separator and a positive electrode sheet in one example of the present application; 1 is a schematic configuration diagram of an electrode body in which an electrode sheet is wound in one example of the present application; FIG. 1 is a schematic configuration diagram of an electrode body in which electrode sheets are laminated according to one example of the present application; FIG. 1 is a schematic configuration diagram of a battery in one embodiment of the present application; FIG. 1 is a schematic configuration diagram of a battery module in one embodiment of the present application; FIG. 1 is a schematic configuration diagram of a battery pack in one embodiment of the present application; FIG. 1 is a schematic configuration diagram of an automobile in one embodiment of the present application; FIG. 1 is a schematic diagram of a vehicle in one embodiment of the present application; FIG.

Embodiments of the present application will now be described in detail, and examples of the described embodiments are shown in the drawings, throughout which the same or similar reference numerals designate the same or similar parts or parts having the same or similar functions. show. The embodiments described below with reference to the drawings are exemplary and are only for the purpose of interpreting the present application and should not be understood as limiting the present application.

In the description of this application, the terms "center", "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" ”, “inner”, “outer”, etc. are based on the orientation or positional relationship shown in the drawings, and are merely for the purpose of easily explaining the present application and simplifying the explanation. should not be taken as limiting the application, as it does not indicate or imply that the device or parts described must have a particular orientation and be configured and operated in a particular orientation. .

It should be noted that the terms "first" and "second" are for descriptive purposes only and indicate or suggest relative importance or imply the number of technical features shown. should not be understood as Thereby, the features defined by "first" and "second" may explicitly or implicitly include one or more of said features. Furthermore, in the description of the present application, unless otherwise specified, "plurality" means two or more.

A battery separator, a battery, a battery module 82, a battery pack 91, and an automobile 100 according to embodiments of the present application will be described below with reference to FIGS. 1 to 13. FIG.

The battery separator includes a separator body 10 and an insulating adhesive tape 20 attached to the separator body 10, as shown in FIG. 1 or FIG. In the present application, the separator body 10 is a common separator in the prior art, and its function is mainly to separate the positive electrode sheet 30 and the negative electrode sheet of the battery, prevent the short circuit caused by the contact of the two electrodes, It is also capable of allowing ions in the electrolyte to pass through. In order to improve the performance of the structure of the separator and thereby improve the performance of the separator itself, the separator in the prior art further includes a film made of polyvinylidene fluoride (PVDF) as a bulk polymer using a phase inversion method. . In the present application, the insulating adhesive tape 20 is attached to the separator body 10, and its main function is to separate the positive electrode sheet 30 and the negative electrode sheet, particularly the die-cut positions of the positive electrode sheet 30 and the negative electrode sheet, The insulating adhesive tape 20 is interposed between the die-cut position of the positive electrode sheet 30 and the negative electrode sheet, insulates them, and prevents burrs remaining after die-cutting from penetrating the separator, thereby achieving a protective effect.

In the present application, the directions of the separator body 10 are defined as a first direction and a second direction, respectively.

Regarding the continuous sheet-like separator body 10, the first direction refers to the length direction of the separator body 10, and the second direction refers to the width direction of the separator body 10. As shown in FIG. 1 or FIG. , the first direction is the horizontal direction, and the second direction is the vertical direction.

The direction in which the tab (positive electrode tab 40 or negative electrode tab 60) is pulled out from the electrode sheet (positive electrode sheet 30 or negative electrode sheet) is the second direction, and as shown in FIG. , that is, the second direction, which is also the width direction of the positive electrode sheet 30, and the direction perpendicular thereto is the first direction (vertical here means that the large surface of the positive electrode sheet 30 is positioned As shown in FIG. 5, the up-down direction, which is the direction in which the positive electrode tab is pulled out, is the second direction, and the left-right direction perpendicular thereto is the first direction, That is, the length direction of the positive electrode sheet 30).

When the cell is a wound cell, the separator body 10 is one continuous sheet, and at this time, the first direction is the winding direction of the separator body 10. As shown in FIG. 1 or FIG. The lateral direction of the sheet-like separator body 10 is the first direction, that is, the winding direction of the battery separator, whereas the second direction is the width direction of the separator body 10, that is, FIG. It is the vertical direction in FIG.

From the viewpoint of the cell 70, the cell length direction, the cell width direction, and the cell thickness direction of the cell 70 are defined, and the lead-out direction of the electrode terminals is regarded as the cell length direction. The direction perpendicular to the length direction of the cell on the plane is regarded as the cell width direction, and the three-dimensional third direction is regarded as the cell thickness direction. In some cases, the first direction is the cell width direction, while the second direction is the cell length direction.

The definition of the directions will be explained in detail with reference to the drawings.

The separator body 10 includes a separator first side 101 and a separator second side 102 facing in a second direction, and as shown in FIGS. 2, 3 and 6, the separator first side 101 is: It is the side of the separator body 10 that is close to the position where the tab is pulled out (in the present application, the installation of the insulating adhesive tape 20 is mainly for solving the problem that the burrs after die-cutting the positive electrode sheet 30 pierce the separator. , In general design, the width of the negative electrode sheet is wider than that of the positive electrode sheet 30, and the die cut position is higher than that, so that even if the separator is pierced, the positive electrode and the negative electrode will not short-circuit, affecting the safety performance. Thus, the separator first side 101 is the side of the separator body 10 that is adjacent to the pulled-out position of the positive electrode tab 40), whereas the separator second side 102 is opposite to the pulled-out position of the tab. is the other side away from At the same time, the separator body 10 includes a separator first end 103 and a separator second end 104 that face each other in the first direction. When defined as edge 103, the outermost edge of separator body 10 is defined as separator second edge 104, and vice versa (where innermost and outermost edges refer to the inner circumference and outermost edge of the winding). Regarding the outer circumference, for example, in the process of winding from the inside to the outside to form a cell, the starting position is the innermost circumference, here the innermost end of the separator body 10, that is, the separator first end 103 and the end position after winding is completed is the outermost circumference, here the outermost end of the separator body 10, that is, the separator second end 104).

For a laminated battery, it is a stack of a plurality of positive electrode sheets, a plurality of negative electrode sheets and a plurality of battery separators, in this case, the pull-out direction of the tab is the second direction, and in the second direction, The separator body 10 includes a separator first side 101 and a separator second side 102, the separator first side 101 being the side proximate the tab withdrawal position and perpendicular to the tab withdrawal direction in the major plane of the separator body 10. What is the first direction, in the first direction, the separator body 10 includes a separator first end 103 and a separator second end 104 (the cell width direction is the first direction, the cell width direction are separator first end 103 and separator second end 104). As shown in FIG. 1 or FIG. 2 , the plane of the separator body 10 shown at this viewing angle is the large plane of the separator body 10 .

As shown in FIG. 2, the horizontal direction is the first direction, and the vertical direction is the second direction. The left end of the separator body 10 located below the separator body 10 is the separator first end 103 , and the right end of the separator body 10 is the separator second end 104 . At the same time, the adhesive tape first side 201 is positioned above the insulating adhesive tape 20, the adhesive tape second side 202 is positioned below the insulating adhesive tape 20, and the left end of the insulating adhesive tape 20 is the adhesive tape. The right end of the insulating adhesive tape 20 , which is the first end 203 , is the adhesive tape second end 204 .

In addition, in all the drawings of the present application, the dimensions or proportionality of each drawing do not limit the technical means of the present application. As shown in FIG. 2, the proportional relationship between the length between the adhesive tape first end 203 and the adhesive tape second end 204 and the separator body 10 cannot represent the actual proportional relationship, In all drawings in this application, only the positional relationship between each part is shown, not specific dimensions or proportions. As shown in FIG. 3 or FIG. 6, the separator first side 101 is above the adhesive tape first side 201, which can be shown and represented in the drawings, but the separator first side 101 is How much longer than the adhesive tape first side 201 in the upward direction, and what the proportional relationship would be, cannot be shown and represented in FIG. 3 or FIG. As shown in FIG. 6, the adhesive tape first side 201 is placed between the separator first side 101 and the separator second side (not shown in FIG. 6, but positioned at the bottom of the separator body in the vertical direction). The coating first side 3031 is located between the adhesive tape first side 201 and the adhesive tape second side 202 , and the adhesive tape second side 202 is located between the coating first side 3031 and the coating second side 3032 . located between Such positional relationships can be expressed in the drawings of the present application, but specific dimensions or proportional relationships are not limited in the drawings of the present application.

The separator first side 101 and the separator second side 102 of the separator body 10 are positioned facing each other in the second direction, and the separator first side 101 and the separator second side 102 both extend along the first direction. As shown in FIG. 2, the separator first side 101 and the separator second side 102 are arranged to face each other in the vertical direction, and the separator first side 101 and the separator second side 102 are both arranged in the horizontal direction. extending along The separator first end 103 and the separator second end 104 of the separator body 10 are arranged to face each other in the first direction, and both the separator first end 103 and the separator second end 104 extend along the second direction. As shown in FIG. 2, the separator first end 103 and the separator second end 104 are arranged to face each other in the horizontal direction, and the separator first end 103 and the separator second end 104 are both arranged in the vertical direction. extending along

The separator body 10 is a rectangular sheet-like body, and the separator first side 101, the separator second side 102, the separator first end 103 and the separator second end 104 are arranged in the circumferential direction of the separator body 10, which is a rectangular sheet-like body. , as shown in FIG.

After assembling the battery separator of the present application into a cell, the positive electrode tab 40 is pulled out from the separator first side 101, and for the unit cell 70, the electrode terminal is also pulled out along the second direction, and the lid plate in the second direction is pulled out. is installed in

In some embodiments of the present application, the positive tab 40 and the negative tab 60 may be pulled out from the same side or from both sides, i. The cathode tab 40 may be located on the separator first side 101 , while the anode tab 60 may be located on the separator second side 102 . The positive electrode tab 40, the separator first side 101 and the adhesive tape first side 201 are located on the same side as shown in FIG. It can effectively prevent the burr at the spot from piercing the battery separator, causing short circuit between the positive electrode and the negative electrode, and affecting the safety of the battery. Correspondingly, when the electrode terminals of the positive electrode and the negative electrode are led out from the same side, the electrode terminals are installed on the cover plate at the end corresponding to the first side 101 of the separator, and the electrode terminals of the positive electrode and the negative electrode are connected from both sides. When pulled out, both the end corresponding to the separator first side 101 and the end corresponding to the separator second side 102 are provided with cover plates, and the positive electrode terminal is connected to the cover plate corresponding to the separator first side 101. , and the negative electrode terminal is led out from the lid plate corresponding to the second side 102 of the separator.

Installed in cooperation with the separator body 10 , the insulating adhesive tape 20 also includes an adhesive tape first side 201 and an adhesive tape second side 202 , and also includes an adhesive tape first end 203 and an adhesive tape second end 204 . the adhesive tape first side 201 and the adhesive tape second side 202 are positioned opposite in the second direction, the adhesive tape first end 203 and the adhesive tape second end 204 are positioned opposite in the first direction; As shown in FIG. 2, the second direction is the vertical direction in FIG. 2, and the first direction is the horizontal direction in FIG. The insulating adhesive tape 20 is attached to the separator body 10 along a first direction, and the adhesive tape first side 201 is installed corresponding to the separator first side 101, that is, the adhesive tape first side 201 and the separator The first side 101 is placed on the same side.

The shape of the separator body 10 is the same, and in some embodiments, the insulating adhesive tape 20 also selects a rectangular sheet-like body, and includes an adhesive tape first side 201, an adhesive tape second side 202, and an adhesive tape first end. 203 and adhesive tape second end 204 are four sides in the circumferential direction of the rectangular sheet, as shown in FIG. The adhesive tape first side 201 coincides with the separator first side 101 and extends along the first direction, and the adhesive tape second side 202 coincides with the separator second side 102 and also extends along the first direction. the adhesive tape first end 203 coincides with the separator first end 103, extends along the second direction, the adhesive tape second side 202 coincides with the separator second side 102, Similarly, it extends along the second direction.

The insulating adhesive tape 20 extends from a separator first end 103 to a separator second end 104 along a first direction (which coincides with the separator body 10 and may be the longitudinal direction of the insulating adhesive tape 20). During the manufacturing process, the insulating adhesive tape 20 may be applied directly to the separator first side 101 of the separator body 10 and extend from the separator first end 103 to the separator second end 104 .

On the other hand, in the method of forming the tab by die-cutting, it is necessary to cut and remove all excess foil material along the length direction (first direction) of the positive electrode sheet 30. In this way, after die-cutting, burrs are , not only around the positive electrode tab 40 but also over the entire positive electrode sheet first side 301 in the first direction. The conventional means of partially applying adhesive tape to the positive electrode tab 40 cannot prevent burrs at other locations on the positive electrode sheet first side 301 from penetrating the separator body 10, and likewise increases the risk of short circuits. exists and presents a safety hazard. In contrast, in the present application, the insulating adhesive tape 20 extends from the separator first end 103 to the separator second end 104 along the first direction, and when it is combined with the positive electrode sheet 30, the insulating adhesive tape 20 can completely cover the first side of the positive electrode tab 40 and the periphery of the positive electrode tab 40 after die cutting, in this way, the burrs at all positions of the positive electrode sheet first side 301 will not pierce the separator body 10 can be prevented and the risk of short circuits can be reduced or even eliminated, improving safety.

On the other hand, since it is not necessary to match the position of the insulating adhesive tape 20 and the position of the positive electrode tab 40 one by one, the difficulty of positioning in the manufacturing process can be reduced, the number of steps can be reduced, and inaccurate positioning can be prevented. The rejection rate and the risk that the finished product fails to protect due to incorrect positioning can be reduced.

As described above, when the battery separator according to the present application is combined with the positive electrode sheet 30 and the negative electrode sheet to form a cell, the insulating adhesive tape 20 attached to the separator main body 10 has burrs remaining after the electrode sheet is die-cut. It is possible to effectively prevent piercing and reduce the risk of a short circuit occurring due to burrs piercing the separator inside the cell. In addition, since the insulating adhesive tape 20 is attached to the separator main body 10 and extends from the separator first end 103 to the separator second end 104 along the first direction, the insulating adhesive tape 20 is not attached during the manufacturing process. There is no need to locate and control the position in the first direction, reducing manufacturing difficulty. At the same time, the combination of the separator body 10 and the insulating adhesive tape 20 can be formed in the process of stacking or winding the cells, so that the installation of the insulating adhesive tape 20 and the cell manufacturing process can be perfectly combined. , the process steps can be reduced, and the die-cutting of the electrode sheet and the installation of the insulating adhesive tape 20 can be separated, and the die-cutting of the electrode sheet is not affected, and the safety assurance is not affected.

In the prior art, in addition to the means of partially sticking the adhesive tape at the position of the tab, another means is to apply a ceramic coating 303 of a certain thickness on both sides of the positive electrode sheet 30 to prevent piercing by burrs. It is to realize a function to prevent However, in the manufacturing process, first, the ceramic coating 303 is applied to both sides of the positive electrode sheet 30, then the positive electrode sheet 30 coated with the ceramic coating 303 is die-cut, and the positive electrode sheet 30 with the positive electrode tab 40 formed by die cutting is obtained. and then combining the positive electrode sheet 30 with the separator and the negative electrode sheet before winding or laminating to form a single cell. In the process, on the one hand, the process requirements are high, and on the other hand, in the die cutting process, the die cutting parameter window is small, which is not conducive to die cutting. Some slags or burrs cannot be covered and still pose a short circuit risk, affecting safety. In addition, in the process of applying the ceramic coating 303, the thickness of the ceramic coating 303 should be strictly controlled, and the control should be completed by real-time monitoring during the application process, and the ceramic coating should be For the positive electrode sheet 30 coated with 303, its die-cutting difficulty is also improved, and the requirements for the die-cutting process change, which imposes much higher requirements on the process and control as a whole. In contrast, in the present application, the production of the insulating adhesive tape is relatively simpler than the application of the ceramic coating 303, and the thickness is easier to control, while the installation of the insulating adhesive tape is more convenient than the positive electrode sheet 30. on the one hand does not affect the die-cutting process of the positive electrode sheet 30, reducing the process difficulty, and on the other hand, it effectively covers the position where burrs occur after die-cutting, reducing the risk of short circuit. can be reduced and safety can be improved.

In some embodiments of the present application, the adhesive tape first side 201 is flush with the separator first side 101, as shown in FIG. In this way, each position of the separator is well protected and can act as a complete stab-proof.

However, in the specific processing and manufacturing process, in order to take into account the deviation correction of the winding machine and the variation in the width slitting process of the insulating adhesive tape 20 and the separator, in some other embodiments, the 3, the adhesive tape first side 201 is set apart from the separator first side 101 by a certain distance, which is less than 1 mm.

In some embodiments of the present application, as shown in FIG. 2, the insulating adhesive tape 20 not only extends along the first direction from the separator first end 103 to the separator second end 104, but also the adhesive tape second end. One end 203 is flush with the separator first end 103 and the adhesive tape second end 204 is flush with the separator second end 104 . After bonding the separator body 10 and the insulating adhesive tape 20 together, the insulating adhesive tape 20 at least partially covers the separator body 10 along the first direction to completely prevent the separator body 10 from being pierced. come true.

For the positive electrode sheet 30, its width directly affects the width of the positive electrode cladding layer 304, which in turn affects the capacity of the battery, i.e., the positive electrode sheet 30 for manufacturing batteries should be wide and wide. The larger, the higher the overall capacity of the battery. Conversely, if the volume is constant, how to effectively utilize the space within the limited volume to obtain greater capacity is a major problem in current batteries. This is a necessary issue, and therefore, theoretically, the wider the positive electrode coating material layer 304 on the positive electrode sheet 30, the better. In the present application, the insulating adhesive tape 20 is attached to the separator main body 10, and when used in a battery, the insulating adhesive tape 20 is positioned between the separator main body 10 and the positive electrode sheet 30, and after the positive electrode sheet 30 is die-cut. The positive electrode sheet 30 and the negative electrode sheet are prevented from contacting and short-circuiting due to burrs piercing the separator body 10. If the insulating adhesive tape 20 is too wide, the positive electrode coating material layer 304 In addition, the insulating adhesive tape 20 cannot cover the positive electrode coating layer 304, otherwise it will affect the performance of the battery and affect the capacity of the positive electrode. The deposition of lithium on the coating layer 304 is inhibited. From the above, in the present application, the width of the insulating adhesive tape 20 should not be too large, otherwise it will cover the positive electrode coating layer 304 or affect the capacity of the battery, and it should not be too small. Otherwise, the technical problem to be solved by the present application cannot be successfully solved and the anti-stick function cannot be achieved. Therefore, in some embodiments of the present application, the width of the insulating adhesive tape 20 along the second direction is between 4 mm and 6 mm.

In order to guarantee the reliability of adhesion between the insulating adhesive tape 20 and the separator body 10, especially in the process of processing the battery, the reliability of adhesion between the two is made particularly high. , the battery separator (combination of the insulating adhesive tape 20 and the separator body 10) must be wound after being stretched, and if the adhesion between the insulating adhesive tape 20 and the separator body 10 is not sufficient, during the stretching process Separation of the insulating adhesive tape 20 and the separator body 10, on the one hand, affects the smooth progress of the manufacturing process, and on the other hand, causes misalignment between the insulating adhesive tape 20 and the separator body 10 after separation, resulting in a final product. It may reduce the yield. Therefore, in the present application, the peel strength between the insulating adhesive tape 20 and the separator body 10 is selected to be 0.11 kgf/cm or more. By improving the adhesiveness between the insulating adhesive tape 20 and the separator body 10, the adhesive force between them is high, and warping deformation does not occur in the manufacturing process of the electrode body, and the battery does not fall off.

After the insulating adhesive tape 20 is attached to the separator body 10, the puncture strength of the entire battery separator can be improved, and in some embodiments, the puncture strength of the battery separator at the position of the insulating adhesive tape 20 is greater than that of the separator. It is two to three times as large as the main body 10 .

In some embodiments, in order to reduce the overall thickness of the battery and improve the energy density, one side of the separator body 10 in the thickness direction is selected to be provided with an insulating adhesive tape 20, and the separator body 10 is It may be the surface facing the negative electrode sheet or the surface facing the positive electrode sheet 30 of the separator body 10. As shown in FIG. By being installed on the facing surface, the burrs after the die-cutting of the positive electrode sheet 30 pierce first the insulating adhesive tape 20 and then the separator body 10, thus reducing the damage of the burrs to the separator body 10. be able to.

In some other embodiments, in order to improve the overall strength of the battery separator, both sides in the thickness direction of the separator body 10 are provided with insulating adhesive tapes 20 to further improve safety.

In the battery separator of the present application, separator first side 101 and separator second side 102 both extend along a first direction, and separator first end 103 and separator second end 104 both extend along a second direction. A separator first side 101 , a separator second side 102 , a separator first end 103 and a separator second end 104 extending along the separator body 10 constitute four sides in the circumferential direction of the separator body 10 .

Correspondingly, adhesive tape first side 201 and adhesive tape second side 202 both extend along a first direction, and adhesive tape first end 203 and adhesive tape second end 204 both extend along a first direction. It extends along two directions.

Adhesive tape second side 202 is placed adjacent separator second side 102 . "Proximity" here refers to the adhesive tape second side 202 being closer to the separator second side 102 than the adhesive tape first side 201 .

At the same time, the adhesive tape first end 203 is installed corresponding to the separator first end 103 and the adhesive tape second end 204 is installed corresponding to the separator second end 104 .

A battery according to the present application includes a positive electrode sheet 30, a negative electrode sheet and a separator, the separator being at least partially disposed between the positive electrode sheet 30 and the negative electrode sheet, as shown in FIGS. includes a cathode sheet first side 301 and a cathode sheet second side 302 placed opposite in a second direction, the separator first side 101 and the cathode sheet first side 301 are placed on the same side, and the cathode sheet A positive electrode tab 40 is installed on the first side 301 and a negative electrode tab 60 is installed on the negative electrode sheet, as shown in FIG.

In some embodiments of the present application, the subject battery separator is manufactured or purchased separately, and then the subject battery separator is applied to the subject battery and the subject battery separator becomes the separator in the subject battery. 100, and together with the positive electrode sheet 30 and the negative electrode sheet 50, a cell of the battery according to the present application may be configured. In the examples, the battery separator of the present application is used as an integral part of the battery of the present application to construct the battery.

In some other embodiments of the present application, the process of manufacturing the battery separator of the present application and the battery of the present application are integrated so that the manufacturing process of the battery of the present application completes the manufacturing of the battery separator of the present application at the same time. The separator 100, the positive electrode sheet 30, the negative electrode sheet 50 and the insulating adhesive tape 20 may be used together to manufacture the battery according to the present application. Not to use.

In short, in the present application the battery separator according to the present application cannot be narrowly considered as a completely independent entity, it may be manufactured first or it may be formed during the manufacturing process of the battery. When interpreting means, first manufacturing or purchasing the battery separator according to the present application, and then applying it to the manufacturing process of the battery according to the present application is only one method of the present application, and is the only interpretation. On the other hand, in another interpretation, the battery separator of the present application is not first manufactured, but the battery separator of the present application is also formed during the manufacturing process of the battery of the present application, and the embodiment of the present application is formed. There is also one and is within the scope of this application. In the battery according to the present application, the scope of protection is the structure including the battery separator according to the present application in the battery. No need to assume.

In some embodiments, the cathode sheet 30 includes a cathode current collector and a cathode coating layer 304 disposed on the cathode current collector, and the anode sheet includes the anode current collector and the anode current collector. and a negative electrode coating material layer disposed on the positive electrode sheet 30 and the negative electrode sheet are separated by a separator.

The positive electrode tab 40 is installed on the positive electrode sheet first side 301, the position of the positive electrode tab 40 corresponds to the separator first side 101, and the separator first side 101 and the positive electrode sheet first side 301 are installed on the same side. . On the other hand, a negative electrode tab 60 is installed on the negative electrode sheet, and corresponding to the positive electrode sheet 30, the negative electrode sheet also includes a negative electrode sheet first side and a negative electrode sheet second side which are placed facing each other in the second direction. , the negative electrode tab 60 may be placed on the first side of the negative electrode sheet or may be placed on the second side of the negative electrode sheet. That is, the positive tab 40 and the negative tab 60 may be located at the same end or at different ends of the battery, and correspondingly, the positive and negative terminals for drawing current may be It may be installed at the same end or may be installed at different ends.

In the battery according to the present application, the separator 100 is the battery separator according to the present application, the positive electrode sheet first side 301 is positioned between the adhesive tape first side 201 and the adhesive tape second side 202 in the second direction, The adhesive tape second side 202 is positioned between the cathode sheet first side 301 and the cathode sheet second side 302 in the second direction.

As shown in FIGS. 2 and 5, in the vertical direction (second direction), the upper side of the separator body 10 is the separator first side 101, and the upper side of the insulating adhesive tape 20 is the adhesive tape first side 201. , the upper side of the positive electrode sheet 30 is the positive electrode sheet first side 301 . Correspondingly, the bottom side of the separator body 10 is the separator second side 102, the bottom side of the insulating adhesive tape 20 is the adhesive tape second side 202, and the bottom side of the positive electrode sheet 30 is the positive electrode sheet second side. 2 side 302 . The cathode sheet first side 301 is higher than the adhesive tape second side 202 , the cathode sheet first side 301 is lower than the adhesive tape first side 201 , the adhesive tape second side 202 is higher than the cathode sheet second side 302 . and the adhesive tape second side 202 is lower than the cathode sheet first side 301 .

In the battery according to the present application, the positive electrode sheet first side 301 is the side after die-cutting, i.e., using a wide positive electrode sheet 30 and performing die-cutting operations on it, the positive electrode tab 40 and the positive electrode sheet first side 301 after die-cutting. and after die cutting, the die cutting may form burrs around the positive electrode sheet first side 301 and the positive electrode tab 40, and when it is directly combined with the separator and the negative electrode sheet to form a cell, the burrs are , may pierce the separator and cause a short circuit between the positive electrode sheet 30 and the negative electrode sheet. Therefore, in the present application, the insulating adhesive tape 20 covers the positive electrode sheet first side 301 and the positive electrode tab 40 portion, and isolates the positive electrode sheet first side 301 and the positive electrode tab 40 portion from the negative electrode sheet, and the burr pierces the separator. and improve battery safety.

In order to prevent the cathode sheet 30 and the anode sheet from shorting due to separator deformation or shrinkage due to other factors, the separator is generally designed to have a width greater than that of the cathode sheet 30 . At least, the separator first side 101 should be placed beyond the positive electrode sheet first side 301, and as shown in FIG. , the separator first side 101 is placed higher than the positive electrode sheet first side 301 in the vertical direction.

In order to ensure the overall performance of the battery, the distance between the separator first side 101 and the positive electrode sheet first side 301 can be 1-2 mm. The die-cut edge of the positive electrode is located on the insulating adhesive tape, and the piercing strength of the insulating adhesive tape is two to three times that of the separator, which reduces the risk of burrs piercing the separator and prevents the adhesive tape from contacting the coating material. Affecting the capacity of the battery can be avoided.

In some embodiments of the present application, the distance between the adhesive tape first side 201 and the positive electrode sheet first side 301 is 1-2 mm. The die-cut edge of the positive electrode is located on the insulating adhesive tape, and the piercing strength of the insulating adhesive tape is two to three times that of the separator, which reduces the risk of burrs piercing the separator and prevents the adhesive tape from contacting the coating material. Affecting the capacity of the battery can be avoided.

In some embodiments of the present application, the insulating adhesive tape has a thickness of 20-30 microns to ensure the hardness of the adhesive tape and prevent the adhesive tape from wrinkling when the adhesive tape is applied. Avoid and improve processing ability.

In some embodiments of the present application, a ceramic coating 303 is applied to the cathode sheet 30 at a position adjacent to the cathode sheet first side 301, as shown in FIGS. side 3031 and a coating second side 3032, the coating first side 3031 being located between the adhesive tape first side 201 and the adhesive tape second side 202, and the adhesive tape second side 202 being the coating second side 3031; Located between one side 3031 and coating second side 3032 . 80-120 micron burrs can occur after die-cutting the ceramic coating, very sharp and by sticking insulating adhesive tape on at least one side of the separator body, the burrs will cause damage to the separator for safety reasons. Risk can be effectively reduced.

In some embodiments, the spacing between the coating second side 3032 and the adhesive tape second side 202 is 1-2 mm, and the die-cut edge of the positive electrode contacts the adhesive tape, thus preventing burrs from penetrating the separator. As a result, the risk of short-circuiting can be reduced, and the adhesive tape can be prevented from coming into contact with the covering material and affecting the capacity of the battery.

In some embodiments, a positive electrode coating layer 304 is applied to the positive electrode sheet 30, and the distance between the side of the positive electrode coating layer 304 adjacent to the positive electrode sheet first side 301 and the adhesive tape second side 202 is is 0-1 mm, so as to avoid the adhesive tape from contacting the coating layer 30 and affecting the capacity of the battery.

In the present application, the positive electrode tab 40 is obtained by die-cutting the positive electrode sheet 30 . At the same time, in the manufacturing process, a positive electrode sheet 30 with a large width is selected and die-cut to form the positive electrode tab 40 , and the side on which the positive electrode tab 40 is formed is defined as the positive electrode sheet first side 301 .

In some embodiments of the present application, as shown in FIG. 7, the positive electrode sheet 30, the negative electrode sheet and the separator are all in the form of integrally continuous sheets, and the electrode assembly of the battery is composed of the positive electrode sheet 30 and the negative electrode sheet. 50 and the separator 100 are laminated and then wound.

The wound electrode body is formed by laminating the positive electrode sheet 30, the negative electrode sheet and the separator and then winding them. Then, the positive electrode sheet 30, the negative electrode sheet and the separator are crimped and wound to form a cell. In general means, first perform the above operation steps, and finally stick the adhesive tape on the positive electrode tab 40 to complete the isolation, or directly apply the ceramic coating 303 on the edge of the positive electrode sheet 30, As noted above, both of the two schemes have drawbacks. Therefore, in the present application, before stretching and unwinding, the insulating adhesive tape 20 and the separator body 10 are first bonded together to form a separator to be unwound, and then stretched, unwound, or stretched. In the unwinding process, the stretching and unwinding structure for the insulating adhesive tape 20 is separately arranged, and the positive electrode sheet 30, the negative electrode sheet, the separator body 10 and the insulating adhesive tape 20 are respectively stretched, unwound, and then wound. In this process, the insulating adhesive tape 20 is crimped onto the separator body 10 and attached.

In the wound cell, the positive electrode sheet 30, the negative electrode sheet 50, and the separator 100 are all integrally continuous sheets, so the separator main body 10 and the insulating adhesive tape 20, which constitute the separator, are all integrally continuous. In the process of unwinding and winding, the separator body 10 and the insulating adhesive tape 20 are stretched, unwound, and further wound to form a cell. In this embodiment, due to the design of the continuous separator body 10 and the insulating adhesive tape 20, the step of attaching the adhesive tape to the positive electrode tab 40 one by one after winding to form the electrode body is omitted, thereby reducing the process, Processing difficulty can be reduced, and costs can be reduced.

In another embodiment, as shown in FIG. 8, the separator is in the form of an integrally continuous sheet, that is, the separator body 10 and the insulating adhesive tape 20 are both integrally continuous sheets, The positive electrode sheet 30 has a plurality of sheets, the negative electrode sheet has a plurality of sheets, and the electrode body of the battery is formed by folding the separator multiple times and inserting one positive electrode sheet 30 or one sheet between two adjacent layers of the separator. It is constructed by inserting negative electrode sheets, and the positive electrode sheets 30 and the negative electrode sheets are alternately installed.

In another embodiment, the separator is in the form of an integrally continuous sheet, the positive electrode sheet 30 has a plurality of sheets, the negative electrode sheet has a plurality of sheets, and the electrode body of the battery includes the separator wound thereon. It is constructed by turning and inserting one positive electrode sheet 30 or one negative electrode sheet between two adjacent layers of the separator, wherein the positive electrode sheet 30 and the negative electrode sheet are alternately installed.

In the above two embodiments, the separator is in the form of an integrally continuous sheet, and the separator body 10 and the insulating adhesive tape 20 are also in the form of an integrally continuous sheet. The adhesive tape 20 can be directly attached, and there is no need to attach the adhesive tape to the positive electrode tabs 40 one by one in the molded cell, which reduces the number of steps, reduces the difficulty of processing, and Reduce costs.

The above three examples are wound cells and laminated cells, respectively. The laminated cell is not a fully laminated cell, but has a plurality of positive electrode sheets 30 and negative electrode sheets, and the separator is an integrally continuous sheet-like separator. The sheets 30 or the negative electrode sheets are laminated one by one between adjacent separators to form cells to construct a battery.

Of course, in some embodiments, a fully stacked cell may use the separators of the present application, which may reduce steps and reduce costs to some extent. At the same time, it is possible to stably assure safety and prevent sticking by burrs.

4 is the positive electrode sheet before die cutting, while FIG. 5 is the positive electrode sheet with the positive electrode tab 40 after die cutting.

The present application further provides a battery module comprising a plurality of the above-described batteries connected in series and/or in parallel. In some embodiments, as shown in FIG. 10, a battery module includes a single cell 70, a plurality of single cells 70 are arranged between two end plates 71, and the upper side of the battery module is covered by a top cover. 72 is covered and fixed.

Therewith, the present application further provides a battery pack comprising the above battery or at least one above battery module according to the present application. In some embodiments, as shown in FIG. 11, the battery pack includes a tray 80 and a plurality of battery modules 82 placed within the tray 80, with the tray 80 for ease of fixation. Around the perimeter are installed lugs 81 that allow the tray to be conveniently attached to the vehicle body.

As shown in FIG. 13, in some embodiments of the present application, a vehicle 100 is provided that includes a plurality of subject batteries or subject battery modules or subject battery packs. In some embodiments, as shown in FIG. 12, automobile 100 includes a chassis 90 and a battery pack 91 mounted on the chassis.

As can be seen from the above, the present application has the above-described excellent properties, and therefore, in use, it has practicality due to the improvement in effects that cannot be achieved by conventional techniques, and is a product with high practical value.

Although the embodiments of the present application have been illustrated and described, it will be appreciated by those skilled in the art that various alterations, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application. As such, the scope of the present application is limited by the claims and their equivalents.

Claims (20)

Including a separator body and an insulating adhesive tape attached to the separator body,
the separator body includes a separator first side and a separator second side facing each other in a second direction, and a separator first end and a separator second end facing each other in the first direction;
The insulating adhesive tape includes a first adhesive tape side and a second adhesive tape side facing each other in the second direction, and an adhesive tape first end and an adhesive tape second side facing each other in the first direction. two ends, and
The insulating adhesive tape is attached to the separator body along the first direction, the first side of the adhesive tape is installed corresponding to the first side of the separator, and the insulating adhesive tape is attached to the first side of the separator. A battery separator extending along a direction from said separator first end to said separator second end. 2. The battery separator of claim 1, wherein said adhesive tape first side is flush with said separator first side. 2. The battery separator according to claim 1, wherein the distance between said adhesive tape first side and said separator first side is 1 mm or less. 2. The battery according to claim 1, wherein the first end of the adhesive tape is flush with the first end of the separator, and the second end of the adhesive tape is flush with the second end of the separator. separator. 2. The battery separator according to claim 1, wherein the width of said insulating adhesive tape along said second direction is 4-6 mm. 2. The battery separator according to claim 1, wherein the peel strength between said insulating adhesive tape and said separator body is 0.11 kgf/cm or more. 2. The battery separator according to claim 1, wherein the piercing strength of the battery separator at the position of the insulating adhesive tape is two to three times the piercing strength of the separator body. The battery separator according to claim 1, wherein the insulating adhesive tape is installed on at least one side of the separator body in the thickness direction. Both the separator first side and the separator second side extend along the first direction, and the separator first end and the separator second end both extend along the second direction. Both the first side of the adhesive tape and the second side of the adhesive tape extend along the first direction, and the first end of the adhesive tape and the second end of the adhesive tape both extend in the second direction. 2. The battery separator of claim 1, extending along a direction. The second side of the adhesive tape is installed adjacent to the second side of the separator, the first end of the adhesive tape is installed corresponding to the first end of the separator, and the second end of the adhesive tape is located close to the separator. 2. The battery separator of claim 1, located in correspondence with the second end. A battery comprising a positive electrode sheet, a negative electrode sheet, and a separator,
The separator is positioned at least partially between the positive electrode sheet and the negative electrode sheet, the positive electrode sheet including a positive electrode sheet first side and a positive electrode sheet second side positioned opposite in a second direction. a battery in which the separator first side and the positive electrode sheet first side are placed on the same side, a positive electrode tab is placed on the positive electrode sheet first side, and a negative electrode tab is placed on the negative electrode sheet,
The separator is the battery separator according to any one of claims 1 to 10, wherein the first side of the positive electrode sheet is positioned between the first side of the adhesive tape and the second side of the adhesive tape in the second direction. and wherein the adhesive tape second side is located between the positive electrode sheet first side and the positive electrode sheet second side in the second direction. 12. The battery of claim 11, wherein the separator first side is placed beyond the positive electrode sheet first side. The distance between the first side of the separator and the first side of the positive electrode sheet is 1-2 mm, and the distance between the first side of the adhesive tape and the first side of the positive electrode sheet is 1-2 mm. 12. The battery according to claim 11, wherein the thickness of said insulating adhesive tape is 20-30 microns. A ceramic coating is applied to a position of the positive electrode sheet adjacent to the positive electrode sheet first side, the ceramic coating includes a coating first side and a coating second side, the coating first side being the adhesive tape first side. and said adhesive tape second side, said adhesive tape second side being located between said coating first side and said coating second side. Battery as described. 15. The battery of claim 14, wherein the spacing between the coating second side and the adhesive tape second side is 1-2 mm. A positive electrode coating material layer is applied to the positive electrode sheet, and the distance between the side of the positive electrode coating material layer adjacent to the first side of the positive electrode sheet and the second side of the adhesive tape is 0 to 1 mm. 12. The battery of claim 11. 12. The battery of claim 11, wherein the cathode tab is obtained by die cutting the cathode sheet. The positive electrode sheet, the negative electrode sheet, the insulating adhesive tape, and the separator are each in the form of an integrally continuous sheet, and the electrode body of the battery is wound after laminating the positive electrode sheet, the negative electrode sheet, and the separator. 12. The battery of claim 11, wherein the battery is formed by: The separator is in the form of an integrally continuous sheet, the positive electrode sheet has a plurality of sheets, the negative electrode sheet has a plurality of sheets, and the electrode body of the battery is formed by folding the separator a plurality of times, and It is constructed by inserting one sheet of the positive electrode sheet or one sheet of the negative electrode sheet between two adjacent layers, or the electrode body of the battery is formed by winding the separator and placing the separator adjacent to the sheet. 11. The positive electrode sheet or the negative electrode sheet is inserted between two layers, and the positive electrode sheet and the negative electrode sheet are alternately installed. batteries described in . A battery pack comprising the battery according to any one of claims 11 to 19.

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